Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7fcfdb3a428608…

MALICIOUS

PDF

115.3 KB Created: 2021-08-20 01:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ff6e53151c2ee3f449b4a7e8131cf380 SHA-1: c3cc13212aad38fab8ef72f48485c6b3ee305da8 SHA-256: 5c7fcfdb3a4286083f1b79843e2e094c98b28ecde21b2037646bccb74fc4dbf3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=barnett+newman+the+sublime+is+now+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/35bb5bfbc502d325744807d4801bd11e/nawagevozibumupevujo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d4308f26743aa92b6212e90e7aee1352/fogokolodajekiwusovurukaz.pdfIn PDF document text
    • https://toocapen.com/files/94776274235.pdfIn PDF document text
    • http://www.asslar.de/downloads/wewapugoguxonajugetonum.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/wonatawelojomoroxap.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/47259521912.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074126baa891---pozaku.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/jebulalerage.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6ba084ebe7799c62deda9d6a18b87bd3/87437987759.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/jinobinogi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/06c5c2bafce4808e072b09bbb0d2f78f/19328710600.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/gavawogapeboxodeguva.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/76789274226.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/80962596646.pdfIn PDF document text
    • https://vleek.com/uploads/files/rivibuwejevumib.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/27ccb3f57d1d52bcc89584c1d7398e49/15883519364.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/48482884426.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/2511052093.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf625ed557b---15625632064.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cdcbefd1---mizumidagof.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf25815670---57312395306.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jemowidexusod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E32 11144 bytes
SHA-256: 4cd90d4ad4c8cf4f6474753b8c825e21c8434ba06d373dd5fe9b1beb3394512c
font_01_sfnt_off000177d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D1 17736 bytes
SHA-256: 7fbd7bdd512bc0c9eee8b45b0c08e5c8f6459f6e3a49ccf38c54be7a9161ce1c
font_02_sfnt_off0001a52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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